Bergen Observer EB Instruction Manual

WARNING! The radio controlled model helicopter built from this kit is not a toy and is not meant for children. It is a flying machine capable of

When you get all 4 SHCS installed, warm the entire shroud to relieve any stress that could cause cracks in the future. In

Install the rear bulkhead using 4 ea 3X16 SHCS and 3M locknuts, then install the landing gear skid bars, front and rear, using

Install the lower frame assembly onto the landing gear, using 4 ea 3X16 SHCS and 3M locknuts. Center and rotate the skid t

Locate the delrin bushings, steel inserts and 4X16 SHCS. Note the chamfer on the steel insert. Install with the chamfer toward

Press the flanged bearings into the upper frames, making certain to seat the flange down. Be sure to make a right and a left,

Insert the elevator yoke into the upper frames, with the longer of shaft on the right side of the helicopter. Find the

Secure the cross pin with a 3X4 setscrew threaded into the rear of the shaft, using loctite. Make doubly sure the setscrew se

Install the autorotation hub into the main gear with the longer portion of the hub facing up. Use 4 ea 3X8 Low Head Cap Screws an

Gather the 26 mm threaded frame spacers and 29 mm non-threaded frames spacers with 4 ea 3X40 SHCS. Secure the rear of t

Set the tail gear pinion mesh by loosening the thru bolt holding the lower main shaft bearing block and transmission cage in place, and loosening

Construction Manual Acknowledgments Bergen R/C Helicopters wishes to thank our friends and customers for their continuing support during the developm

The swashplate is next; install 4 ea medium balls on the inner ring, using loctite. After installing these balls, make sure the

Insert the 3X7X3 flanged bearings into the arms, 2 ea into each arm. Insert the 3X16 SHCS with 6M shoulder through the bear

Assemble the control system; starting with the collective arms (popsickle sticks), aileron bellcranks, and “X” arm. Install the

Install the left side popsickle stick, matching the broach in the popsickle stick to the flats on the collective axle, using

Install the triple bellcrank on the left side, on the collective axle, matching the broach with the flats on the axle. The si

When both bearings are installed, center the seesaw tube by tapping on the head of the bolts. The seesaw tube should pivot fr

You may need to use the blade grips to push the circlips into place, just make sure they are seated all the way around. Now slide

With both blade grips installed, use 2 allen wrenches to tighten the blade grip bolts. Tighten securely, but there is no need t

Install 2 ea short balls on the mixers. Note that one end of the arm is longer than the other, and orientation of the bal

Flybar installation is next. Insert the flybar through the seesaw tube bearings; install a 4mm special washer on each side

Introduction The first of its kind, interchangeable modular engineered helicopter to accommodate the beginner to a FAI expert… An idea in 1994 to ma

Install the fuel tank, starting with locating where the fuel fittings will be installed in the tank. Slide the tank under

Install the tank under the rear tray and secure with the 2 long tye-wraps provided, running the tye-wraps through slots in the tray.

Snap the air filter cover in place and secure with the slide on the bottom. Now install the fuel lines from the tank t

Begin assembling the camera mount by installing the Front Frame Block and Arm Mounts to the “flying squirrel”, noting the orie

Install 1 ea thrust bearing block w/4 ea 3X8 SHCS and 1 ea standard bearing block w/2ea 3X35 SHCS and 2 ea 3M locknuts onto th

Locate the three round spacers and place on the three shafts; the lower ones go on the inside of the blocks, the upper on

Push the assembly all the way up, push the split collar down on top of the thrust bearing and tighten the split collar bolt,

Install the small pulley/servo wheel onto the servo, then place one of the servo assemblies in between the extension arms, an

To get the full 360 degree rotation with out winding up the servo wires, try this little tip. With a 12” long servo exte

Begin assembly of the tail system with the “dogbone”. Insert the crosspin and secure with a 3X4 setscrew from inside

Consumer Warranty IMPORTANT! Before building the Observer EB Helicopter kit, read and fully understand the following warranty, and review the entire

Install the “dogbone” assembly in the front end of the short arrow shaft, again with a collar and only 1 ea 3X3 setscrew to s

Assemble the tail pitch bellcrank by installing a 3X7X3 flanged bearing in one side, the aluminum spacer,

Slide the pitch slider onto the shaft engaging the ball into the delrin cup at the same time. Locate the Heavy Duty tail hu

Locate the 4M shoulder bolts and eyelets. Slip the eyelet onto the shoulder bolt and install on the blade grip with loctit

These pictures show installation of V-Blades tail blades as an option. Others may be used and install the same way.

Install the Horizontal Fin using 2 ea 3X8 SHCS with a drop of CA glue in place of loctite. Your fins may be solid or have

The tail servo mount is installed between the vertical and horizontal fins using 2 sets of boom clamps, and 4 ea 3X30 SHCS

The pushrods are made up of 2.5mm SS rods with threads rolled onto them and the famed Rocket City Links threaded onto the rod

The pushrod from the swashplate to the bell-hiller mixer is 98 mm from center to center, using the 75 mm long pushrods.

The collective servo is installed between the frames, with the spline to the rear. The aileron servo is install

1. Not withstanding the paragraph above, this warranty is in addition to whatever implied warranties may be granted to the Purchaser by law. To t

When you have each wheel marked, put a ball on a 2X10 Phillips screw, thread a 2M nut up to the ball, then screw the assem

Collective servo wheel is installed with the offset to the rear; pushrods are 50 mm long, center to center using 30mm lo

Install Gyro on the mounting plate, preferably with the green Zeal anti vibration gel, and connect

The radio setup numbers for JR radio is as follows; Futaba radios will be similar but may require slight changes. The tail setup procedure is sug

To static track the tail blades, try this. Fold both blades up against the blade grips. Push one blade in until it tou

Install the NHP 800 MM Blades, first inserting the brass bushing into the root. Put a pl

With the pushrod lengths given earlier you should be close to a 0 degree pitch at half stick, -6 or so at bottom stick and +1

You can install Pool Noodles on the landing gear as a visual aid; you may need to divert the exhaust as shown to prevent melting the foam.

Slowly spool up the blades, checking the tracking. Adjust as necessary by adjusting the length of the pushrod from the swashplate to the bell mixer.

Congratulations on your purchase of a Bergen R/C Helicopters Observer EB. The EB stands for Extended Boom, allowing the use of 810 mm rotor blades.

Start with the landing gear. Assemble the skids and cross bars as shown, leaving them loose for now. Locate the landing gear

Install the pull start using 4 ea 4X12 SHCS. Again, loctite isn’t needed, however if you feel the need, you can use a drop of

Tap the high side down carefully, using a small hammer, hitting flat on the tops of the fan blades, then checking the runout.